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arXiv 2103.12708hep-latcond-mat.stat-mech
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二维格点SU($N_c$)规范理论与多味伴随标量场

Two-dimensional lattice SU($N_c$) gauge theories with multiflavor adjoint scalar fields

Claudio Bonati, Alessio Franchi, Andrea Pelissetto, Ettore Vicari

摘要:

考虑二维格点SU($N_c$)规范理论,其中$N_f$实标量场在规范群的伴随表象中变换,且具有整体O($N_f$)不变性.我们聚焦于具有$N_f\ge 3$的系统,研究它们的零温度极限,以了解在何种条件下存在连续极限,并研究相关的量子场论的性质。扩展以前的分析,我们解决规范群表示和四次标量势在确定连续极限的性质(当它存在时)发挥的作用。我们的结果进一步证实了这样一个猜想,即二维格点规范模型的连续极限与多味标量场,当它存在时,是与一个$σ$模型定义在一个对称空间,具有相同的整体对称性的格点模型。

英文摘要:

We consider two-dimensional lattice SU($N_c$) gauge theories with $N_f$ real scalar fields transforming in the adjoint representation of the gauge group and with a global O($N_f$) invariance. Focusing on systems with $N_f\ge 3$, we study their zero-temperature limit, to understand under which conditions a continuum limit exists, and to investigate the nature of the associated quantum field theory. Extending previous analyses, we address the role that the gauge-group representation and the quartic scalar potential play in determining the nature of the continuum limit (when it exists). Our results further corroborate the conjecture that the continuum limit of two-dimensional lattice gauge models with multiflavor scalar fields, when it exists, is associated with a $σ$ model defined on a symmetric space that has the same global symmetry as the lattice model.

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